Adjustable feed for boring devices.



H. T. DONOHUE.

ADJUSTABLE FEED FOR BORING DEVICES.

APPLICATION FILED FEB. 14. 1916.

1,265,630. mm May 7,1918. 7

lg 1519 J2 J3 HENRY T. DONOHUE, OF CHICAGO,

ILLINOIS.

ADJUSTABLE FEED FOR BORING DEVICES.

Specification of Letters Patent.

Patented May 7, 1918.

Application filed February 14, 1916. Serial No. 78,195.

To all whom it may concern.- I

Be it known that I, HENRY T. DoNoHUn, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful improvements in Adjustable Feeds for Boring Devices, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to adjustable feeds for boring devices.

One of the objects of my invention is to provide an improved device which can be easily and quickly adjusted to bring it in proper position with respect to the bit,

which will be simple in construction and will give a substantial support for the bit.

Further objects will appear from the detailed description to follow, taken in connection with the appended claims.

In the drawing in which Ihave shown one embodiment of myv invention Figure l is a view inside elevation of my adjustable device in I driven boring implement of conventional form;

Fig. 2 is a transverse cross sectional view (enlarged) through the same, showing the parts in locked position;

Fig. 3 is a similar view with the parts in unlocked position; and

Fig. 4 is a longitudinal cross-sectional view of the adjustable device shown in Fig. 1.

Referring to the drawing in detail, in Fig. l a bit 5 is shown driven by a ratchet mechanism 6 by means of an operating handle 7. These parts are shown in conventional form and require no further description, as, in themselves, they form no part of the present invention. The bit 5 has a rearward extension in the form of a machine threaded stem 8 on which is mounted the adjustable device.

The latter consists of an inner core 9 and an outer cylindrical member. The inner core 9 has a central bore 10 which is threaded for about one-fifth of its length, as appears in Fig. 4, whereby the adjustable use with a ratchet,

member is threaded onto the threaded stem the latter being ordinarily approximately the same length as the member 9. This core 9 is provided with plurality, in this instance four, of broad parallel ridges 11 running from end to end than the spaces between the same, though it isto be understood that these proportions are not essential. Each ridge 11 is cut with a plurality of teeth 12 which are parallel to one another and substantially at right angles to the axis of the core 9. If desired these teeth 12 of the diiferent ridges 11 may form a mutilated thread.

Embracing the core 9 is a cylindrical outer member 13 of substantially the same length as the core 9. At one end, as appears in Fig. at, the outer memberl3 is open to receive the core 9 and at the other end is a cap 14. Against the outer face of this cap 1% is a plate 15 secured to the cap by a screw 16 which passes through a Washer 17 inside the cap, through the cap 14 and into the plate 15. The latteris provided with a central sharpened pin 18 by means of which the adjustable device is held firmly against a joist, old man or the like, as more fully hereinafter appears.

The inner surface of the cylindrical outer member 13 is formed with a plurality of circumferential ridges substantially at right angles to the axis of the member. Each ridge is cut away at a plurality of spaced intervals, in this instance four, leavin four rows of comparatively broad teeth 19. If desired these teeth 19 of the diiferent ridges may form a mutilated thread. It will be seen that as a result of this construction the inner surface of this cylindrical member 13 has four rows of teeth in spaced relation extending from end to end, corresponding to the four rows of teeth on the inner core 9. The spaces between the teeth of the cylindrical member 13 are slightly wider than the teeth 12 on the core 9 and conversely the teeth 19 on the cylindrical member 13 are slightly narrower than the spaces between the teeth 12 of the core 9.

The ;outward extension of the teeth is of the member the width of each ridge being slightly less are in alineinent vvi he 1; c between the teeth 19 ot the cjfl "1 al member 13 the parts are capable of movement. the rows or teeth of one member moving without hindrance in the cor responding channel or the other member. ll hen, however, the parts are given a slight relative turning movement, so that the rows of teeth of the one member line up with the rows in the other member, the teeth are of an extent to intermesh, thus, as will be read ily apparent, locking the parts against rota tive longitudinal movement. lurning the parts in the opposite direction to bring the teeth out of mesh again permits relative longitudinal movement. To prevent any relative rotative motion more than enough to lock and unlock the parts a plate 20 is screwed. to the core 9 running from end to end of the same, and at one edge thereof is an upward extending stop 21, the plate lying in one ot the channels so as not to interfere with the operation of the device in any way. lrleierring to Fig. 2 it will be seen that the inner core 9 cannot be rotated any further in a clockwise direction because the stop strikes against the adjacent row of teeth 19 on the member 13. The inner core can be turned in a contra-clockwise direction until the stop 21 strikes the next row of teeth 19 (that row shown at the bottom of Fig. 2) or in other words, enough to permit the parts to be turned out ot meshing or looking position but no further. To prevent the inner core 9 from becoming completely withdrawn from the outer cylinder a small plate is secured to one of the core channels at the inner end thereof and a screw '22 passing through the cylindrical member 13 and down into the channel serves as a stop to prevent further withdrawal of the core.

This device capable of a multitude of applications and tor example Fig. l illus trates its use in the operation of boring a hole in a joist tor the purpose of running pipes and the like. The adjustable device being screwed onto the threaded stem 8, the drill point is placed up against the joist 23, the one to be bored, and the cylindrical member 1, the parts being in unlocked position, is moved as above described toward the next joist 2% until the pointed pin 18 firmly engages the same and the cylindrical member 13 is given the necessary turn to lock the parts against relative longitudinal movement as above described. If it should s0 happen that the space between joists 23- 93%: is greater than the length of core 9 plus the cylindrical member 13, the core can be screwed further out on the stem 8 and the above operation thus carried out. it will be seen that this action firmly wedges the whole device between the joists to effectively support the bit. It will be seen that, if the movement of the cylindrical member is not enough to firmly wedge the device in place, or it at any time tightening is necessary, a slight turn of the core 9 on the stem 8 will remedy the matter. The handle 7 is then operated to drive the bit until the hole is bored, whereupon movement of the cylindrical member 13 back on the core, the slight unlocking turn being first given, permits the whole device to be removed from between the joists.

An adjustable teed device of the character described not only provides a supportfor the bit in carrying out inconvenient boring of this nature, but in addition it makes possible a wide range of adjustment. As will be seen, then it will fit spaces ranging from one corresponding in length to the distance from the drilling point to the pin lcl'when the adjustable device is completely telescopcd and the core is screwed fully onto the stem up to a distance measured by the same limits when the core is moved out to the end of the stem, minus, 01'': course, the width of the joist to be bored, and the adjustable device is moved to the limit ct its relative extension, 71. 0., stem plus core'plus cylinder.

Furthermore the adjustment is readily andrapidly made inasmuch as ordinarily all that is necessary is the quick longitudinal movement of the cylinder, the slight twistto lock the same and perhaps a slight turn of the core on the stem for a firmer wedge. The device may be used in various ways, as for example, in boiler-ratchets, electric and automatic drills as well as hand drills.

Lastly there are no complicative or relatively delicate parts to get out of order, the whole being extremely simple and durable Having thus described-my invention what It claim as new and desire to secureby Lettersl atent is:

1. An adjustable teed for boring devices comprising a tubular member provided with means for engaging a support,-and a second tubular internally screw threaded member for engaging a screw threaded bit shank extending within said first tubular member and rotatable and slidable therein, said first tubular member being provided on its interior with a longitudinally extending series of teeth, and said rotatable member being provided with a longitudinally extending series of teeth movable into and out of inter-engagement with said first-series by rotation ofsaid rotatable member.

2. An adjustable feed for boring devices comprising a tubular member provided with means tor engaging a support, and a memher provided with means for engaging a bit lated thread movable into and out of intershank extending Within said tubular memengagement with said first mutilated thread her and rotatable and slidable therein, said by rotation of said rotatable member.

tubular member being provided on its in In witness whereof, I have hereunto sub 5 terior with a mutilated thread, and said roscribed my name.

tatable member being provided with a muti- HENRY T. DONOHUE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

